Christianity stands or falls by what is believed and thought about Jesus. Brunner's thorough and provocative analysis of the Biblical doctrine of the Person and the work of Christ, establishing Jesus Christ as the Mediator between God and man, not only made the central theme of Christianity live again, but established him as one of the great modern theologians. Why should there be an intermediary between God and mankind? Brunner's answer is that what matters supremely is not whether man is 'aware' of, or has a 'feeling' for 'something divine', but whether there is only one 'place' at which God challenges man to decision.
The God who is real and alive is the God who confronts man in such a way that man knows that he must act. And Jesus Christ, the Mediator, confronts man with the true and living God. The deity of Christ, the humanity of Christ, the God-Man, the Incarnation, and the Atonement are re-examined and rescued from misunderstanding. The result is a clear and provocative discussion concluding that only in Jesus Christ can we know ourselves as we really are; and only in Jesus Christ can God be known as he really is.